Metal fastener



w. L DIMOUSH METAL FASTENER May 2, 1939.

iled March 17 1938 Qnnenfor- Q I Qttorncg Patented May 2, 1939 UNITED STATES PATENT OFFICE 1 METAL FASTENER. William Leonard Dimoush, Independence, M0. Application March 17, 1936, Serial No. 196,336

' 2 Claims. (o1. s5 11) My invention relates to improvements in metal fasteners. It. is particularly well adapted for being driven into and holding together two pieces of wood disposed edge to edge.

One of the objects of my invention is the production of a'fastenerof the kind,.which is strong, cheaply made, durable and which will have 'a minimum tendency toward splitting the wood.

1 A further object of my invention isthe provision of novel means for engaging the wood into which the fastener has been driven, for preventing the fastener working out of the wood.

The novel features of my invention are herein- 6 15 after fully described and claimed.

In the accompanying drawing which illustrates my invention,

Figs. 1 and 2 are respectively side and end elevations of one form of my invention in which 20 the sheet-like fastener has transverse corrugations having sharp angular meeting edges.

Fig. '3 is an edge view of two pieces of wood connected together with the fastener shown in Fig. 1.

25 Figs. 4 and 5 are respectively side and edge elevations of another form of my invention in which the transverse corrugations are curvilinear.

Fig. 6 is a view, similar to Fig. 3, in which the 30 fastener shown in Fig. 4 connects together two pieces of wood disposed edge to edge.

Fig. '7 is an enlarged side elevation of a lower middle portion-of the fastener'shown in Fig. 1. Fig. 8 is an enlarged section, partly broken 35 away, on the line 8-8 of Fig. 4.

Fig. 9 is a view, similar. to Fig. 7, of the lower.

middle portion of the fastener shown in Fig. 4. Fig. 10 is a view, similar to Fig. 1, of another form of my invention of the type shown in Fig. v1,

40 but having its lower entering edge convexly 'arcuate.

Fig. 11 is an upper edge view of the fastener shown in Fig. 10.

Fig. 12 is a view, similar to Fig. 4, of another form of my invention of the type shown in Fig. 4, but having its lower entering edge conve dy arcuate.

I Fig. 13 is an upper edge view of still another 0 form of my invention in which the body-of the fastener is a flat plate with a serrated lower entering edge, and having lateral projections on opposite sides. s

Fig. 14 is a side elevation of the fastener shown 55 in Fig. 13.

Similar characters of reference designate similar parts in the different views.

Referring to Figs. 1, 2, 3 and '7, the fastener comprises a sheet-like metal body I having an upper straight blunt driving edge 2, and a lower 5 sharpened serrated entering edge 3. The body I has between the edges 2 and 3 transverse corrugations 4 which are flat, and are provided with sharp -angular meeting edges, the flat corrugations 4 which are next to each other extending 10 at a like angle in opposite directions.

The middle corrugation diverges downwardly, and the corrugations at opposite sides of the middle one incline downwardly in opposite directions.

In the grooves of the corrugations 4, spaced 15 from and between the edges 2 and 3, are lateral projections 5, which incline downwardly, and, as

shown, are hollow and semiconical, and for their full lengths at opposite sides merge into the body I, as shown in dotted lines in Fig. 3.

The object of the projections 5 is to prevent the fastener, after having been driven into the two pieces of wood 6 disposed edge to edge, as

.shown in- Fig. 3, from working upwardly out of the wood pieces 6. By having the projections 5 slant downwardly and inwardly, they offer small resistance to the fastener being driven into the wood pieces. By having each lateral projection 5 merge for its full length at its opposite sides into the body I, no opening is provided between the projection and the body I that would permit wood to enter and resist the driving of the fastener into the wood.

By having the sides of the corrugations flat and with sharp angular meeting edges, as shown in Fig. 3, and with the flat sides of adjacent corrugations 4 diverging at a like angle in opposite directions, the fastener, while being driven into the two wood pieces 6, will cut the wood, obliquely to its grain, and willnot be so liable 0 to split the wood, as would the fastener, shown in Fig. 4, which has curvilinear corrugations.

In the form shown in Figs. 4, 5 and 6, the structure corresponds to the fastener shown in Figs, 1, 2 and 3, excepting in the forms of the corrugations 1 into which the sheet-like metal body 8 is formed. The corrugations "l are curvilinear lengthwise of the body 8, and like the corrugations, they extend transversely from the upper driving edge to the lower serrated cutting edge, said edges being respectively designated 9 ,and Ill. The middle corrugation diverges from the driving edge 9 to the lower edge l0, and the corrugations at opposite sides of the middle corrugation extend respectively downwardly oband location to the projections 5 of Fig. 1, are

respectively provided in the grooves of the corrugations him a like purpose of preventing the fastener working out of thewood pieces 6 into which they are driven and hold together.

The form of the lateral projection 5, which is employed in each form of my invention, is well shown in Fig. 8, each projection 5 being. preferably -formed by being cut with a tool from the sheet metal which forms the body of the fastener, the tool cutting a slit parallel with the length of the body and transversely through the sheet in a groove in the corrugation, and then forcing the portion below the slit into a lateral extension which slants downwardly and inwardly, and which at opposite side edges merges into the body for the full length of the projection 5. This operation results in the projection 5 having a horizontal upper edge which engages the wood and prevents the fastener working out of the wood, while its downwardly converging form, permits the fastener to be easily driven.

With this form of projection a maximum of strength is afforded to resist distortion of the projection while it is being driven, and such splinters of wood, as may enter -upwardly through the side opposite that from which the projection extends, will slip upwardly easily and will not materially resist the driving of the fastener.

The form shown in Figs. 10 and 11 corresponds to the form shown in Figs. 1, 2 and 3, excepting that the lower edge of the fastener, designated by 3 is convexly arcuate lengthwise of the body I of the fastener.

In the form shown in Fig. 12, the loweredge I is convexly arcuate, as the loweredge is in the form shown in Fig. 10. In all other respects the fastener shown in Fig. 12 corresponds in structure to the fastener shown in Figs. 4, 5, 6 and 8.

In the form shown in Figs. 13 and 14, the fastener comprises a flatv plate ll having a straight longitudinal upper driving edge and a serrated lower entering edge l3. Intermediate of these edges opposite sides of the body II are respectively provided with lateral projections 5,

50 corresponding in form and function to the projections provided in the other forms of my invention.

In each form of my invention, the lower cutting edge of the fastener is disposed on top of the upper edges of two pieces of wood 6, disposed edge to edge, as shown in Figs. 3 and 6, with the body of the fastener disposed lengthwise of the wooden pieces, and with the middle portion of the fastener crossing the joint between the wooden pieces, after the fastener is driven downwardly into the wood until its upper edge is flush with the upper edges of the wooden pieces, thereby securely holding the latter together.

When driven into hard wood, the fasteners with the arcuate lower entering edges, shown in Figs. and 12, are easier to drive into the wood.

In the forms shown in Figs. 1 and 4, the corrugations hold the fasteners from being pulled lengthwise from the wooden pieces. In the form shown in Fig. 14, the lateral projections 5, serve the double function of keeping the fastener from being pulled lengthwise'from the wooden pieces, and of holding the fastener from working upwardly out of the'wooden pieces.

Other modifications of my invention, within the scope of the appended claims, may be made without departing from the spirit of my invention.

What I claim is:

1. A sheet-like metal fastener having driving and entering edges, and transverse corrugations extending to said edges, said entering edge converging from its ends toward its middle portion, and having lateral projections in some of the grooves of said corru'gations, each of said projections slanting downwardly and inwardly from a point spaced from and between said edges and merging for its full length at opposite sides into said corrugations.

'2. A sheet-like metal fastener having driving and entering edges, and transverse corrugations extending to said edges, and having lateral projections in some of the grooves of said corrugations, each of said projections slanting downwardly and inwardlyfrom a point spaced from and between said edges and merging for its full length at opposite sides into the adjacent corrugations.

WILLIAM LEONARD DIMOUSH. 

